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The fitness of Cardiff captain Sean Morrison appears the most likely reason for Connolly being called back. Morrison was admitted to hospital on Monday night for “a procedure” and is considered a doubt for the Bluebirds’ Premier League game with Newcastle United.

Hull City Manager Nigel Adkins. (Image: Focus)

Asked for the reasons behind the hold-up, Adkins added: “I’m not at liberty to say anything more. Matthew Connolly is an excellent young man who came with a great character reference. He’s a good person but these things sometimes happen.

“All sorts of things go on. At this moment in time he won’t be joining us but that’s not to say he won’t join us.”

City will keep their options open with a fortnight of the transfer window remaining, with Adkins still also keen on landing a new winger and a centre forward to replace Will Keane.